Voids cancel a completed sale before the payment is processed. Typically, you will process a void on the same day, before your account batches out (10 PM ET). If you have a sale time stamped after 10 PM, you can void it before 10 PM the following day.
To void a transaction:
Refunds differ from voids in that the transaction has been completed and the payment has been processed. In a refund, the cardholder is credited back funds to their bank account. The refund amount must be greater than $0.00 but cannot exceed the total transaction amount.
To refund a transaction: